Sailor in Eilat arrested (3)
I believe the answer is:
tar
'sailor' is the definition.
(term for a sailor)
'in eilat arrested' is the wordplay.
'in' indicates a hidden word.
'TAR' is hidden within 'eilat arrested'.
(Other definitions for tar that I've seen before include "'Thick, dark, sticky liquid (3)'" , "A sailor; a preservative" , "not put on ship in proverbial case of false economy?" , "Dark flammable liquid" , "It paves the way" .)